Patent US2831637A successfully refreshed from Google Patents.
US3139936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helicopter control mechanism
Assignee: Power Jets Research and Development Ltd
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Filing: 1962-12-10
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Granted: 1964-07-07
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Expires: 1982-12-10
Abstract
No abstract record available.
Inventors
- 👤 Davidson Ivor Macaulay
- 👤 Islip Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:01
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/22; B64C27/26; B64C27/32; B64C27/325
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
AN AIRCRAFT COMPRISING A HELICOPTER ROTOR INCLUDING A ROTOR HEAD AND A ROTOR BLADE ATTACHED THERETO, THE ROTOR BLADE HAVING A ROUNDED TRAILING EDGE SURFACE AND BEING FORMED WITH TWO LONGITUDINALLY EXTENDING DISCHARGE APERTURES; MEANS TO SUPPLY FLUID TO SAID APERTURES, SAID APERTURES BEING ARRANGED TO DISCHARGE THE FLUID AS LONG THIN LAYERS UPWARDLY AND DOWNWARDLY TOWARDS ONE ANOTHER OVER THE TRAILING EDGE SURFACE; AND LIFT CONTROL MECHANISM COMPRISING TWO OBTURATING MEMBERS, ONE FOR EACH APERTURE, OPERABLE TO VARY THE WIDTH THEREOF, TWO DRAW BARS, ONE FOR EACH APERTURE, MOUNTED WITHIN AND EXTENDING LONGITUDINALLY OF THE BLADE, TWO CAM MEMBERS, ONE CARRIED BY EACH DRAW BAR AND EACH HAVING A CAM FACE, TWO FOLLOWERS, ONE CONNECTED TO EACH DRAW BAR AND BEARING ON THE CAM FACE OF THE RESPECTIVE CAM MEMBER, AND MEANS FOR MOVING THE DRAW BARS LONGITUDINALLY OF THE BLADE TO EFFECT RELATIVE MOVEMENT OF THE CAM MEMBERS AND FOLLOWERS SO THAT THE OBTURATING MEMBERS ARE OPERATED TO VARY THE WIDTH OF THE TWO APERTURES IN OPPOSITE SENSES.
Claim 2
Dependent Claim
170 words
AN AIRCRAFT COMPRISING A HELICOPTER ROTOR INCLUDING A ROTOR HEAD AND A ROTOR BLADE ATTACHED THERETO, THE ROTOR BLADE HAVING A ROUNDED TRAILING EDGE SURFACE AND BEING FORMED WITH TWO LONGITUDINALLY EXTENDING DISCHARGE APERTURES; MEANS TO SUPPLY FLUID TO SAID APERTURES, SAID APERTURES BEING ARRANGED TO DISCHARGE THE FLUID AS LONG THIN LAYERS UPWARDLY AND DOWNWARDLY TOWARDS ONE ANOTHER OVER THE TRAILING EDGE SURFACE; AND LIFT CONTROL MECHANISM COMPRISING TWO OBTURATING MEMBERS, ONE FOR EACH APERTURE, OPERABLE TO VARY THE WIDTH THEREOF, TWO DRAW BARS, ONE FOR EACH APERTURE, MOUNTED WITHIN AND EXTENDING LONGITUDINALLY OF THE BLADE, TWO CAM MEMBERS, ONE CARRIED BY EACH DRAW BAR AND EACH HAVING A CAM FACE, TWO FOLLOWERS, ONE CONNECTED TO EACH DRAW BAR AND BEARING ON THE CAM FACE OF THE RESPECTIVE CAM MEMBER, AND MEANS FOR MOVING THE DRAW BARS LONGITUDINALLY OF THE BLADE TO EFFECT RELATIVE MOVEMENT OF THE CAM MEMBERS AND FOLLOWERS SO THAT THE OBTURATING MEMBERS ARE OPERATED TO VARY THE WIDTH OF THE TWO APERTURES IN OPPOSITE SENSES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |